Solutions
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Krakout's post in Containers stopped working - don't know where to start was marked as the answerOk, so I managed to solve it - Zoneminder, which I installed yesterday, filled my cache drive and everything locked up; and cache stayed full even after removing Zoneminder.
By the way, appdata is set to cache only, is this a good practice? I don't remember how and why I set it up when I first installed unRAID...